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5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

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Old 04-21-2005, 12:01 PM   #1 (permalink)
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My E-39 makes a loud drone at startup, and continues for a minute or so, depending on outside temp. Sounds like some sort of air pump, what is it, and can it be stopped, or is it normal?
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Old 04-21-2005, 01:32 PM   #2 (permalink)
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if it is in-fact the air pump, yes it's normal - it's getting the engine ready ... it's basically an emissions thing.

if it's not the air pump, you might have a problem. check it out. Air pump should be toward the front of the engine compartment, have a listen.
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